Lining for cement-drying kilns



July 15. 1924.

K- J. L. LUNDBERG Mummy FOR CEMENT DRYING KILNs Filed July 8, 1922 dummes;

Patented July 15, 1924.

- UNITEDA STATES vPlpxfTlzvrJT OFFICE.

JOHN Il. LUNDBERG, OF ALPENA, iMICHIGAN,` ASSIGNOR TO HURON INDUSTRIES, INC.,

' f OF ALPENA, MICHIGAN, A CORPORATION OF MICHIGAN.

LINING Fon CEMENT-murine KILNs.

Application led July 8,

` T0 all whomztlmag/ concern.

Be it known that I, J oHN L. LUNDBERG, a subject o f the King of Sweden, residing at Alpena, in the county of Alpena and State of Michigan, have invented certain new and useful Improvements in Linings for Cement-Drying Kilns, of whichthe following l is a specification.

This invention relates to kilns and especially to a cement drying kiln. The object of the invention is to provide a combined lifter'and liner construction which will be cheap to manufacture and which can be replaced -in parts in the cylinder without any'great delay or loss in .the operation of thekiln. These kilns are ordinarily used for drying' crushed lime stone before it is ground and introduced into the cement roasting kiln. y

vHeretofore it has been the practice to bolt Z-bars to the sideof the shell. n This constitutes the lifter; no lining has ordinarily been used. These Z-bars have been made of rolled steel bolted t0 the outer shell,V usually about thick and 8 in width. After' about a 4year and a half continuous run, the material Wears the Z-bars away at the` base and cuts them ofi". The material also wears vthe outer shell, and it is necessary to cut out a piece of the shell `and replace it with a nevvr piece of sheet steel. The time required for this type of repair is often as high as five days, which results in seriously impairing the operation of the cement mill.

After the shell has been repaired vas above, in a few months it will start to wear again in between the Z-bars. In the course of a long run of time, say five years, whole sections of the kiln have to be taken ofi' and replaced with new, requiring two or three weeks to manufacture the sections and eect the repair. The object of my invention is to obviate these difficulties.

In the drawings,- f Fig. l is a cross section of a cement drying cylinder equipped with my improved liner and lifter.

Fig. 2 isa fragmentary, longitudinal section of the shell on the line 22 of Fig. 1.

a designates the outer shell of the cylinder which is'ordinarily steel plate. Bolted to this shell are a plurality of liner sec'- 1922. Serial No. 573,530.

to use two recesses so that a supporting webV f is left at the center to contact with the shell, making a liner which has all the strength of a solid liner, 'yet is considerably lighter. y The liner c has substantiallyL the same construction `eXcept that it has projecting inwardlythe lifter webs g which has ka sort of a'C-.bar cross section,'perhaps more accurately ydescribed as a shallow C. These C-bars or webs'are provided at their bases with reinforcingribs which very much strengthen these C-bars sothat when the material considerably wears them, although the face ofthe bar maybe very much reduced, still' the bar has sufficient strength so as not to shear ofi' as has been the case with the rolled Z-bars that have heretofore been used. They also have reinforcing ribs .'12 on the face of the lifters for the same purpose. n

These lining segments distribute the load and strains originating on the lifting members over a larger area of the outer shell than was the case with the Z-bar construction, consequently the outer shell is not subjected to the strains in particular parts such as was the case with the old lifters. This will permit the shell to be made of lighter material than has heretofore been the case. l/Vith theold Z'bar construction, it is customary to have the Z-bars run the entire length of the kiln, usually 100 feet in length. With my new lifter construction I divide the lifters up intov relatively short sections so'that either form of liner b or 0 may be replaced when any of them become worn or broken. Replacement can be made in from three to live hours. It is simply necessary to loosen the bolts and lift the liner segment out and to replace same with anew segment. It will be evident that this results in a large saving of time in repairing. Further1nore, these liners makea very eective protection"y tor the shell so" that the shell will rWear a great many times longer than has been the case With the old :form of litters. `The litters themselves can be made of very much heavier stock, being castings, .and reinforcing ribs assure them of very much longer lite than has been xthe case yWith the rolled metal litters.

lVhat I claim is:

l. In a cylinder for the purpose specified, the combination of yan outer shell and a plurality ot' cast-metal cylinder segments, some o'twhich have inwardly projecting shallow C-portions having at vtheir bases reinforcing ribs and means for detachably securing said segments tothe inside of the shell.v

Q In a cylinder for the purpose specified, the combination of a plurality of cast-metal cylindersegments, having their backs reccssed and'son'ieoitithem having integral iny combination of an outer shell and `a plurality of metal cylinder segments some ot t which have :inwardly yprojecting radially extending `Webs forming litters for raising thelnnestone and bolts and nutsfor detachably bolting said segments through the outer shell so that an individual segment may be Yremoved Without disturbing the others.

5. In a cylinder for drying crushed lime stone, the combination of an outer shell and a plurality ot cast metal cylinder segments arranged to lit together to form a complete lining for the interior of the shell some of said segments having inwardly and radially projecting C portions in the form of angularly disposed Webs acting as litters for raisingthe crushed lime stone and means 'for detachably securing said segments to the inside of the shell so that one segment may be removed without disturbing the others.

6. In a cylinder for drying crushed lime stone, the combination ot' an outer metal shell and a plurality of cast metal cylinder segments arranged to lit together t0 cover the entire inner surface of the shell some of said segments provided with shallow C Webs inwardly and radially projecting to form litters for raising the crushed lime stone and bolt and nut means for detachably securing said segments separately through the outer metal shell so that lone segment may be removed Without disturbi-ng the adjacent ones.

7. In a cylinder for drying crushed lime stone, the combination of an outer metal shell, a plurality of metal liners in the form of segments fitted together to cover the inside of the cylinder but detachable Without disturbingadjacent segments some of the segments provided with inwardly projecting lifting Webs and means for detachably securing individual segments to the outer shell so that the same may be removed'witlr out disturbing the adjacent segments.

In testimony whereof I atlix my Signature.

JOHN L. LUNDBERG. 

